Giant Horsetail, Great Horsetail

Equisetum telmateia var. braunii

Synonym: Equisetum maximum

A close-up of the fertile stalk of giant horsetail as seen along the Springwater Trail near Palmblad Road to the east of Gresham, OR..........April 13, 2017.

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A close-up of the teeth at several joints on the fertile stalk of giant horsetail as seen along the Springwater Trail near Palmblad Road to the east of Gresham, OR.........April 2, 2011. The teeth are clustered into groups of two to four.

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Giant horsetails observed along the Springwater Trail where Rugg Road crosses Johnson Creek several miles east of Gresham, OR.......April 10, 2020.